Plants (30–)60–100 cm. Stem white tomentose, especially above, with fibrous collar. Leaf blade triangular-ovate, ternate-2-pinnate; ultimate segments rhombic-obovate or ovate, 1–4 × 1.2–3 cm, adaxially sparsely pubescent, abaxially roughened, densely pubescent, gray-green. Synflorescence much branched; umbels 2.5–8(–16) cm across; bracts absent or few, linear, ca. 5 mm, deciduous; rays 8–15(–22), 1–3(–10) cm, unequal, inner faces hispid, outer faces glabrous; bracteoles 6–10, lanceolate, unequal, shorter than flowers, densely pubescent; umbellules 12–20-flowered. Calyx teeth small, triangular. Petals white, adaxially finely papillose, abaxially white pubescent. Styles longer than stylopodium. Fruit ovoid-ellipsoid, 4–5 × 3–4 mm, densely hispid; dorsal ribs somewhat prominent, lateral ribs winged, wings ca. 1/3 width of body, thin; vittae 3–4 in each furrow, 6–8 on commissure. Fl. and fr. Aug–Oct.